GROSS FLOOR AREA (GFA) – TOWN PLANNING

A typical town plan defines GFA to mean "the sum of the area of all floors of the building measured from the external faces of the exterior walls, or from the centre line of walls separating the building from any other building, excluding an area used solely for rooftop fixed mechanical plant and/or basement car parking". In the circumstances listed below GFA will be calculated as detailed:

• stairwells and liftwells should be counted as contributing to GFA once only (these components are not considered to be floor area for subsequent levels).
• basement parking also incorporates parking for bicycles, where such areas are designed in accordance with the relevant Australian Standard, and can be excluded from the GFA calculation.
• voids within an atrium design can be excluded from the GFA provided the initial floor area of the atrium is included.
• mezzanines are considered to be a floor and should be included in the calculation.

See:

gross area

gross lettable area